Empty Blocks Do Not Show Up/Block validation allows empty title and body

Issue Link: 
http://drupal.org/node/402662
criticality: 
Moderate
Drupal7: 
Fixed
Task: 
Create block in right sidebar
This happened to: 
Participant 10

A user created a block, but did not enter a title or body so they could just see what it would look like. However with both values empty, the block is never actually shown even if it is enabled.

Solution: 
Require a body or title.